Circuit-breaker.



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UNITED STATES Patented June '7, 1904:.

PATENT OFFICE.

JOHN R. ANDERSON, JR., OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO STANLEYELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHUSETTS,CORPORATION OF NEIV JERSEY.

CIRCUIT-BREAKER.

SPECIFICATION forming part of Letters Patent N0. 761,748, dated June '7,1904.

Application filed September 12, 1903. Serial No. 172,869. (No model.)

To all whom it may concern.-

Be it known that I, J OHN R. ANDnRsoN. Jr. a citizen of the UnitedStates, and a resident of Pittsfield, Massachusetts, have inventedcertain new and useful Improvements in Circuit-Breakers, of which thefollowing is a specification.

My invention relates to breakers for electric circuits, and particularlyto the tripping devices for such breakers.

The object of my invention is to provide a trippingdevice and a means ofadjustment therefor which shall be more simple and eco' nomical inconstruction and which shall permit a liner and more even adjustmentthroughout the entire range of the breaker than has been possible informer constructions.

In the accompanying drawings, Figure 1 shows a side view of acircuit-breaker provided with a tripping device constructed inaccordancewith my invention. Fig. 2 shows a front view of the settingdevice. Fig. 3 shows a plan View of the guide for the solenoid-core.

In the drawings, A represents a switch, which when closed is adapted toconnect contacts a (0. Switch A is pivoted at Z)- B is a spring whichtends to throw the switch A out of engagement with its contacts. SwitchA isnormally held closed by catch C, which is engaged by the catch D,pivoted at (Z. Catch D is held in engagement with catch C, either bygravity, as shown in the drawings, or by any suitable method, such as aspring.

E represents a solenoid, which in the drawings is shown connected inseries with one of the contacts a a.

F is the core or plunger for the solenoid,

carrying the rod f, which is adapted to strike catch D when core F isdrawn up, and thus to release switch A.

Gr represents a guide for the core is supported by screws 9 g.

I represents a shaft on the end of which is carried the cam J. CamJsupports the weight of core F.

K is an index dial or plate carried by shaft I.

76 is an index-point for dial K.

L is a milled head carried by shaft I, by means of which the cam J andthe plate K may be set. By turning head L camJ is revolved so as toraise or lower core F, thereby varying the number of amperes at whichthe core F will be drawn up by solenoid E. The amperes at which thebreaker will open for the different settings of cam J are indicated onplate K, as shown in Fig. 2. It is evident that the cam J may be shapedon acurve corresponding to the pull of the solenoid on the core in itsdifferent positions. By this means an even spacing of the index-marks onplate K may be obtained, thus permitting a finer adjustment throughoutthe range of the breaker than is possible in ordinary constructions.

Although I have shown my setting device applied to a particular form ofcircuit-breaker, it will be understood that my invention is in no waylimited to any particular type, but may be used with any well-known formof circuit-breaker. Accordingly I do not desire to limit myself to theparticular construction and arrangement of parts here shown, sincechanges therein which do not depart from the spirit of my invention andwhich are within the scope of the appended claims will be obvious tothose skilled in the art.

Having thus fully described my invention, I claim as new and desire toprotect by Letters Patent 1. In a circuit-breaker, a trip-magnet, amovable trip-armature, a device for indicating the setting of saidarmature, and means intermediate to said device and the armature adaptedto vary the pull of said magnet upon said armature by equal amounts inaccordance with equal movements of said indicating device.

2. In a circuit-breaker, a trip-magnet, a movable trip-armature, and asetting device for said armature adapted to vary the pull of said magneton said armature by equal amounts in accordance with equal angularmovements of said setting device.

10 erated by the movement of said core, a shaft,

a cam carried by said shaft and supporting said core, and an indexdevice carried by said shaft, said cam being so shaped that the units ofsaid index device are of equal length.

Signed at Pittslield, Massachusetts, this 8th I 5 day of September,1903.

JOHN R. ANDERSON, JR. itnesses:

L. A. HAWKINs, M. H. JONES.

